Do this for iphone/ipad users (you should be doing this periodically)
Mobile Safari for iOS (iPhone, iPod touch, iPad)
To clear cache and cookies:
- From the home screen, Select Settings > Safari.
- At the bottom of Safari's settings screen, Select Clear cookies and data or Clear Cookies and Clear Cache.
- Confirm when prompted.
To clear history:
- From the home screen, tap Safari.
- At the bottom of the screen, tap the Bookmarks icon.
- In the lower left, tap Clear.
- Tap Clear History.
For other browsers, laptops, etc:
How to Clear the Cache and Cookies in Your Web Browser | Information Technology Services
For those of you with a desktop or laptop, you should have and use this program.
CCleaner Makes Your Computer Faster & More Secure | Official Website